chemical element

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chemical element
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chemical element, Chemical element - Chemical symbols, Chemical element - Chemistry terminology, Chemical element - Description, Chemical element - Nomenclature, Chemical element - General chemical symbols, Chemical element - Nonelement symbols, Chemical element - Specific chemical elements, Abundance of the chemical elements, Compound, Chemical elements named after people, Chemical elements named after places, Chemistry, Discovery of the chemical elements, Elements song, Fictional element, Periodic table, Systematic element name, Chemistry resources, Table of chemical elements

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chemical element: Encyclopedia - Chemical element

A chemical element, often called simply element, is a chemical substance that cannot be divided or changed into other chemical substances by any ordinary chemical technique. The smallest unit of this kind of chemical substances is an atom. An element is a class of substances that contain the same number of protons in all its atoms. Chemical element - Chemistry terminology. Earlier an element or pure element was defined as a substance which "cannot be further broken down ...

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chemical element: Encyclopedia II - Chemical element - Chemical symbols Chemical element - Specific chemical elements. Before chemistry became a science, alchemists had designed arcane symbols for both metals and common compounds. These were however used as abbreviations in diagrams or procedures; there was no concept of one atoms combining to form molecules. With his advances in the atomic theory of matter, John Dalton devised his own simpler symbols, based on circles, which were to be used to depict molecules. These were superceded by the current typographical system in which chemi ...

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chemical element: Encyclopedia - Chemical formula

A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. It identifies each type of chemical element by its element symbol and identifies the number of atoms of such element to be found in each discrete molecule of that compound. The number of atoms (if greater than one) is indicated as a subscript (although 19th-century books often used superscripts). For non-molecular substances the subscripts indicate the ratio of elements in ...

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chemical element: Encyclopedia - Chemical elements data references

Recommended values for many properties of the elements, together with various references, are collected on these data pages. Any changes to the infobox data should be checked against these pages, and/or the available references should be expanded accordingly, so that the decision for or against certain values remains transparent and easily retraceable. Other related archives

chemical element: Encyclopedia - Chemical substance

A chemical substance is any material substance used in or obtained by a process in chemistry: A chemical element is a substance that cannot be divided or changed into different substances by ordinary chemical methods. The smallest particle of such an element is an atom, which consists of electrons centered about a nucleus of protons and neutrons. A chemical compound is a substance consisting of two or more chemical elements that are chemically combined in fixed proportions.

chemical element: Encyclopedia - Element symbol

A chemical symbol is an abbreviation or short representation of the name of a chemical element. Natural elements all have symbols of one or two letters; some man-made elements have temporary symbols of three letters. Chemical symbols are listed in the periodic table and are used as shorthand and in chemical equations, e.g., . Because chemical symbols are often derived from the Latin or Greek name of the element, they may not bear much similar t ...

chemical element: Encyclopedia - Atom

An atom (Greek άτομον from ά: non and τομον: divisible) is a submicroscopic structure found in all ordinary matter. It is the smallest unit of an element to retain all the chemical properties of that element. The word atom originally meant a smallest possible particle of matter, not further divisible. Later, the objects that had been called atoms were found to be further divisible into smaller subatomic particles, but the word a ...

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Atom - Properties of the atom

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chemical element: Encyclopedia - Bond length

Bond length or bond distance in molecular geometry is the distance between two bonded atoms in a molecule. Bond length - Explanation. Bond length is directly related to bond order, when more electrons participate in bond formation the bond will get shorter. Bond length is also directly related to bond strength and the bond dissociation energy as a stronger bond is also a shorter bond. In a bond between two identical atoms half the bond distance is equal to the covalent radius. Bond lengths are measured in m ...

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chemical element: Encyclopedia - Chemical composition

The chemical composition of a substance refers to the chemical elements of which the substance is composed. For example, common table salt is composed of sodium and chlorine, but this familiar chemical compound is also found in halite. See also: chemical compound Other related archiveschemical compound, chemical elements, chlorine, halite, sodium, table salt

chemical element: Encyclopedia - Chemical series

A chemical series is a group of chemical elements whose physical and chemical characteristics vary progressively from one end of the series to another. Chemical series were discovered before the creation of the periodic table of the chemical elements, which was created to try to organise the elements according to their chemical properties. Several chemical series correspond exactly to periodic table groups: this is not a coincidence, the physical properties that group them arise from the same atomic orbital configurations that place them in the same group in the periodic table. ...

chemical element: Encyclopedia - Chemical equation

A chemical equation is a symbolic representation of a chemical reaction. It is a formula used to display different stages for chemical reactions, where chemical substances are changed into other substances. The elements and/or compounds to the left of the arrow in a chemical equation represent the reactants, the arrow represents the transition stage, and the species to the right of the arrow represent the products. The four basic chemical equations are: A → B ...

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Chemical equation - Linear system balancing

chemical element: Encyclopedia - Biogeochemical cycle

In ecology, a biogeochemical cycle is a circuit or pathway by which a chemical element or molecule moves through both biotic ("bio-") and abiotic ("geo-") compartments of an ecosystem. In effect, the element is recycled, although in some such cycles there may be places (called "sinks") where the element is accumulated or held for a long period of time. All chemical elements occurring in organisms are part of biogeochemical cycles. In addition to being a part of living organisms, these chemical elements also cycle through abioti ...

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Biogeochemical cycle - Nitrogen Cycle: A quick Summary

chemical element: Encyclopedia - Atomic mass

The atomic mass of a chemical element (also known as the relative atomic mass or average atomic mass or atomic weight) is the average atomic mass of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance. Periodic tables usually list these with reference to the local environment of Earth's crust and atmosphere. For artificial elements the nucleon count of the most stable is ...

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Atomic mass - History

chemical element: Encyclopedia - AS

AS - As. Chemistry arsenic (As), chemical symbol for the chemical element Mythology: in Norse mythology refers to the Aesir. in Egyptian mythology is an alternate spelling for Ash (god). Geography: As (municipality) in Belgium Ås, Askershus fylke, Norway Ås, Krokoms kommun, Sweden Ås, Nora kommun, Sweden Ås, Gislaveds kommun, Swe ...

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chemical element: Encyclopedia - Dubnium

Dubnium (formerly also called Eka-Tantalum, Hahnium and Unnilpentium) is a chemical element in the periodic table that has the symbol Db and atomic number 105. This is a highly radioactive synthetic element whose most stable isotope has a half life of 16 hours (dubnium-268). This relatively high stability compared to the surrounding elements on the periodic table gives evidence that by manipulating the number of neutrons in a nucleus, ...

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Dubnium - History

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chemical element: Encyclopedia - Substance

Substance may refer to: Substance theory: in philosophy, substance is that element of an object without which it would not exist Chemical substance: in chemistry, a substance is an element, compound or a mixture of elements and compounds. If a substance is not a mixture it is called a pure substance. Substance (medicine): in medicine, substance is any drug, chemical, or biologic entity, as well as any material capable of being self-administered or abused because of its physiologic or psychologic e

chemical element: Encyclopedia - Chemical oceanography

Chemical oceanography is the study of the behaviour of the chemical elements within the Earth's oceans. The ocean is unique in that it contains - in greater or lesser quantities - nearly every element in the periodic table. Thus much of chemical oceanography describes the cycling of these elements both within the ocean and with the other spheres of the Earth system (see biogeochemical cycle). These cycles are usually characterised as quantitative fluxes between constituent reservoirs defined within the ocean system. Of particular glob

chemical element: Encyclopedia - Zn

Zn can mean: The chemical element zinc ZN can also mean: Air Bourbon (IATA code) zettanewton, a unit of force Category: Lists of two-letter combinations ...

Read more here: » Zn: Encyclopedia - Zn

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